JPH10192410A - Medical guide wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical guide wire by which the tip can be easily extended in a fine blood vessel without giving pain on a patient, a medical liquid and a contrast medium can be sent to the diseased part, and a balloon can be expanded by forming the wire like a pipe by a Ni-Ti base elastic alloy. SOLUTION: A medical guide wire 1 comprises a long guide wire main body 2 formed like a pipe by a Ni-Ti base elastic alloy, a small-diameter part 3 reduced in diameter toward the tip, a hole 5 bored in the small diameter part 3 to be communicated with a hollow part 4 of the guide wire main body 2, and a balloon 6 mounted on the small diameter part. Since the guide wire main body 2 is formed of material obtained by mixing 43-46wt.% titanium with 54-57wt.% nickel, the weight can be reduced by 30-50% as compared with the conventional linear guide wire, good flexibility and restoring capability can be attained, and further the diameter can easily be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical guidewire used for percutaneously inserting a catheter into a blood vessel, and is particularly suitable for expanding a stenotic part of a blood vessel using a balloon. Medical guidewire.

[0002]

2. Description of the Related Art Conventionally, by inserting a flexible guide wire into a body cavity and holding the other end of the extracorporeal wire, the affected part, such as a blood vessel, is located deep in the body cavity. 2. Description of the Related Art Drugs for treating and diagnosing tumors and varicose veins in the trachea, esophagus, digestive tract, large intestine, rectum or urethra are administered.

In recent years, a treatment using a PTCA (percutaneous transluminal coronary angioplasty) catheter has been performed for the purpose of expanding a stenosis site of a blood vessel. This PTCA catheter has a balloon provided at the distal end of the catheter. The catheter is inserted into a blood vessel, the balloon is positioned at a stenosis site of the blood vessel, and the balloon is inflated to expand the stenosis site. Things.

[0004] Incidentally, such a conventional guide wire is formed of a flexible wire such as a high-tensile stainless steel wire or a superelastic alloy wire, so that it is heavy and, therefore, has a small intravascular flow. Induced load, that is, the artificial weight transmitted to the tip of the guide wire is increased, and the blood vessel wall is easily damaged. The outer circumference of the catheter must be covered with a tube made of a polymer resin and a chemical solution or contrast agent must be flowed between the tube and the guide wire. It is difficult to reach the catheter to
When a balloon is attached to such a thickened catheter, there is a problem in that the patient is forced to suffer.

The present invention has been made in view of the above situation, and an object of the present invention is to form a medical guide wire into a pipe shape by using a Ni-Ti based elastic alloy to form a guide wire. It is possible to have a very small diameter with flexibility and resilience, so that the distal end of the guide wire can be easily reached even in a small blood vessel without causing pain to the patient, and furthermore, this guide wire is Because it is formed in a pipe shape, it is possible to send a drug solution, a contrast agent, etc. to the affected area without covering the outer periphery of the guide wire with a polymer resin tube, and to send a gas or liquid through the pipe to form a balloon. Another object of the present invention is to provide a medical guidewire which can be easily inflated.

[0006]

In order to achieve the above object, a medical guidewire according to the present invention comprises:
It is characterized by being formed in a pipe shape from a Ni-Ti based elastic alloy.

According to the present invention, as another means for achieving the above object, the distal end of a pipe-shaped guide wire body made of a Ni—Ti-based elastic alloy has a smaller diameter toward the distal end. It is characterized by having been formed.

Further, in the present invention, as still another means for achieving the above-mentioned object, the same type of alloy or a different type of alloy or a different type of alloy is provided at the tip of a guide wire body formed of a Ni-Ti type elastic alloy in a pipe shape. Is characterized by connecting a tubular body or a linear body formed of a polymer resin.

In the present invention, the surface of the guide wire body is preferably coated with a hydrophilic polymer compound or a derivative of the hydrophilic polymer compound.

[0010] In the present invention, the tubular body may include:
It is desirable that the diameter be reduced toward the tip and that the polymer be covered with a polymer resin.

Further, according to the present invention, an inflation balloon can be connected to the guide wire body or the tubular body.

An X-ray opaque metal is adhered to the surface of the guide wire body, the tubular body, or the dilatation balloon, thereby facilitating the position of the guide wire body, the tubular body, or the dilatation balloon in the body. It is desirable to be configured so as to be able to confirm.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, a medical guidewire 1 according to this embodiment is a long guidewire body 2 formed in a pipe shape from a Ni--Ti elastic alloy.
A small-diameter portion 3 reduced in diameter toward the distal end of the guide wire main body 2, a hole 5 opened in the small-diameter portion 3 and communicating with the hollow portion 4 of the guide wire main body 2, And a balloon 6 attached to the small diameter portion 3.

The guide wire body 2 is made of, for example, nickel of 54-57% by weight and titanium of 43-46% by weight.
The weight% is mixed, so that the weight can be reduced by 30 to 50% compared with the conventional linear guide wire, and the flexibility and the restoring property are rich.
The diameter can be easily reduced.

[0016] Due to this weight reduction, an induced load in a thin blood vessel,
That is, the artificial load transmitted to the distal end of the guide wire can be reduced, so that damage to the blood vessel wall can be effectively prevented. Generally, this type of guide wire is a medical device used for guiding a catheter to a target position, but since the guide wire according to the present invention has catheter characteristics, it is necessary to prepare a separate catheter. And pain to the patient can be greatly reduced.

Further, since the guide wire main body 2 is formed in a pipe shape, it is possible to feed a medicine, a contrast agent and the like to the affected part through the hollow part 4 and to send air using the hollow part 4. Therefore, unlike the conventional catheter, air can be passed from the hollow portion 4 to the small-diameter portion 3 through the air hole 5 without forming an air flow path by covering the outer circumference of the guide wire with a tube. Since the balloon 6 can be sent to the balloon 6, the balloon 6 can be easily inflated at the target position.

Bands 7 and 8 are wound around the base and the middle of the distal end of the small-diameter portion 3, and the balloon 6 is mounted between the bands 7 and 8 so as not to move in the axial direction.
In this embodiment, the small-diameter portion 3 is formed of the same Ni-Ti-based elastic alloy as that of the guide wire main body 2. Curing can be imparted by forming it into a structure, but in this case, the surface of the small diameter portion is coated with a polymer resin to impart flexibility, thereby preventing damage to the blood vessel wall and the like. It is desirable to configure so that

A gold marker 9 is fixed to the balloon 6, and a gold or platinum marker 10 is fixed to the outer periphery of the distal end of the small diameter portion 3 having a rounded distal end. Since each of these markers 9 and 10 is a metal that does not transmit X-rays, the in-vivo position of the guide wire body 2 or the inflation balloon 6 can be easily confirmed by X-ray photography.

[0020]

As described above, according to the medical guide wire according to the present invention, since the medical guide wire is formed in a pipe shape from a Ni-Ti based elastic alloy, the guide wire is made flexible. As a result, the distal end of the guidewire can be easily reached even in a small blood vessel without causing pain to the patient, and the guidewire is formed in a pipe shape. As it is formed, it is possible to send a drug solution or a contrast agent to the affected area without coating the polymer resin tube on the outer circumference of the guide wire, and it is also easy to make a balloon by sending gas or liquid through the pipe. Many excellent effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a medical guidewire according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Medical guide wire 2 Guide wire main body 3 Small diameter part 4 Hollow part 6 Balloon 9,10 Marker

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[Procedure amendment]

[Submission date] March 7, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art Conventionally, a flexible guide wire is inserted into a body cavity, and an appropriate catheter is guided by operating the other end of the wire outside the body so that a deep position in the body cavity can be guided. Affected area, for example, blood vessels, trachea, esophagus,
2. Description of the Related Art Medication solutions for treatment and diagnosis of tumors such as digestive organs, large intestine, rectum, and urethra, and varicose veins are used.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

Incidentally, such a conventional guide wire is formed of a flexible wire material such as a high-tensile stainless steel wire or an elastic alloy wire, so that it is heavy and, therefore, has a small diameter in a thin blood vessel. The induced load, that is, the artificial weight transmitted to the tip of the guide wire is increased, and the blood vessel wall is likely to be damaged. Since a tube made of a polymer resin must be coated on the tube and a chemical solution or contrast agent must be flowed and sent between this tube and the guide wire, the outer diameter of the catheter becomes large, and even thin blood vessels with affected areas can be used. In addition to making it difficult to reach the catheter, there is a problem that when a balloon is attached to such a thickened catheter, the patient is forced to suffer.

Claims (8)

[Claims] 1. A medical guidewire formed of a Ni-Ti elastic alloy into a pipe shape. 2. A medical guidewire, wherein a distal end portion of a guidewire body formed in a pipe shape from a Ni—Ti-based elastic alloy is formed to have a smaller diameter toward the distal end. 3. A tubular or linear body made of the same alloy, a different alloy, or a polymer resin is connected to a distal end of a guide wire body made of a Ni-Ti elastic alloy in a pipe shape. A medical guidewire characterized by the following: 4. The guide wire according to claim 1, wherein the surface of the guide wire body is coated with a hydrophilic polymer compound or a derivative of the hydrophilic polymer compound. Medical guidewire. 5. The medical guidewire according to claim 3, wherein the tubular body is formed to have a smaller diameter toward a distal end. 6. The medical guidewire according to claim 3, wherein the tubular body is coated with a polymer resin. 7. The medical guidewire according to claim 1, wherein an expansion balloon is connected to the guidewire body or the tubular body. 8. A radiopaque metal is adhered to a surface of the guide wire body, the tubular body, or the dilatation balloon. Medical guidewire.